Supporting single tilde `~` as a strikethrough text

[amitse]

Code of Conduct

• I have read and agree to the GitHub Docs project's Code of Conduct

What article on docs.github.com is affected?

https://docs.github.com/en/get-started/writing-on-github/getting-started-with-writing-and-formatting-on-github/basic-writing-and-formatting-syntax#styling-text
strikethrough

What part(s) of the article would you like to see updated?

Strikethrough | ~~ ~~ | None | ~~This was mistaken text~~ | This was mistaken text -- | -- | -- | -- | --

Additional information

Accoding to GFM both single tilde ~ and double tilde ~~ are valid strikethrough markers,

Why don't we mention abnout single tilde ~ in the github docs?

~Sample single tilde~
~~sample double tilde~~

Output
Sample single tilde
sample double tilde

[welcome]

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[Sharra-writes]

Thanks so much for opening this issue! You, or anyone else, are welcome to submit a PR with this fix.